Disable Mac AVFoundation for WebRTC browser tests.

chrome/browser/media/chrome_webrtc_apprtc_browsertest.cc

Index: chrome/browser/media/chrome_webrtc_apprtc_browsertest.cc
diff --git a/chrome/browser/media/chrome_webrtc_apprtc_browsertest.cc b/chrome/browser/media/chrome_webrtc_apprtc_browsertest.cc
index 4dddd5264fd7f96f10c3a9c6c717629951af443a..b1207a734bfb62f18565ec330f30478417c08390 100644
--- a/chrome/browser/media/chrome_webrtc_apprtc_browsertest.cc
+++ b/chrome/browser/media/chrome_webrtc_apprtc_browsertest.cc
@@ -55,6 +55,12 @@ class WebRtcApprtcBrowserTest : public WebRtcTestBase {
     // The video playback will not work without a GPU, so force its use here.
     command_line->AppendSwitch(switches::kUseGpuInTests);
 
+#if defined(OS_MACOSX)
+    // TODO(mcasas): Remove this switch when ManyCam virtual video capture
+    // device starts supporting AVFoundation, see http://crbug.com/327618.
+    command_line->AppendSwitch(switches::kDisableAVFoundation);
+#endif
+
     CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kUseFakeDeviceForMediaStream);
   }